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Newby—Glad to be here and need your expert opinions!

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Hello everyone! I am new to the forum and the possibility of doing some watch repair/maintenance at home. I started enjoying clocks as a kid when my parents bought a 6-foot Grandmother clock in the early 70s. I still own this clock today and it is one of my most prized possessions. My first watch was a Timex Hopalong Cassidy watch in the late 60s. Today, I own a dozen watches ... ranging from Seiko, Pulsar, to Timex ... with a couple of Casio "disposable" resin watches for good measure (you know ... the one's you wear when cutting the lawn!). I live in New Jersey at the shore and I am very happy to be here!

So here is my situation that I need some opinions on. I have an old Timex Model 87 (84 Series) Back-Set Electronic watch (965608772) - circa 1972. It was my dad's and has been sitting since the mid-80s. It is in very good cosmetic shape. I just put a fresh silver-oxide battery in it and can hear the movement working. However, it doesn't tell time. I did the rotary shake to give it a kick-start and it ran for 10 minutes and stopped. When I turn the hands to set the time, the second hand spins extremely fast around the dial several times, then stops. From my research, I have found that the movement is removed only by removing the crystal ... which I have no tools to do yet. It is very sentimental to me and I would like to get it working again. Even to swap out the movement from a like watch, or even consider the possibility of converting it to quartz. I am not sure what is the correct movement type to look for. I believe the case is 36 mm ... which I can always measure to be certain. Finding specs on this watch has been nearly impossible. Any suggestions would be most appreciated. Thanks again!

Note: I inadvertently posted this question in an old thread first by accident. So if you see it ... just disregard it!



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    • The hairspring looks ok in the first photo you posted.  It that is concerning if the regulator causes excessive change when only moved very slightly. Better quality movements have longer hairsprings generally, which permits finer regulation. These hairsprings are reasonably long.    If you really wanted to, you could mount the hairspring alone on the cock and check that it looks right in terms of alignment with the jewel hole. Getting the terminal radius corrected can be tricky, but yours at least looks consistent.    In terms of your timing variations, the effect is being exacerbated by lack of amplitude. Don’t let this allow you to jump to the conclusion that the balance is out of poise. Get the amplitude up and see where you get to. I think your pendant positions are possibly showing excessive drop in amplitude. Given that this movement has been mucked about with previously, check the balance pivots aren’t bent, even though it has an antishock setting. 
    • I think that maybe because I tripped it off the lifting arm because i'd taken the hands off to remove the dial.
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    • @JohnR725 @rodabod Stripped, cleaned, and lubricated again. When I originally got it, there was a small kink in the spring near the regulator, which I was able to decently fix I think. I examined it again today, and it looks like the terminal curve might be off, which I imagine is what is causing such significant timing changes when I try to regulate. A hair adjustment will easily make a 30 second change, but I dont know if that is normal or not. Photos attached. Dial Down: +1  254°  0.2 Dual Up: -7 236 ° 0.2 Pendant Right: -24 184° .1 Pendant Left: -31 194° 0.0 Pendant Up: -46 183° 0.2 Pendant Down: -23 191° 0.0 Dial Up again after: -3 238° 0.0 Time grapher at 44° and averaging on 20 seconds. 
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